Electric fuse and method of making same



March 9 1926.

A. F. WEISE ELECTRIC FUSE AND METHOD OF MAKING SAME Filed Sept. 1.0, 1924 InventQY: Albert F. Weiss, by MW His Attorney.

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- 1 [COMI-YANY, A CORPORATION 01 NEWYY RK.

or BRInGEroR'r; CONNECTICUT; nssienon TQGENERAL nLnoTRIc ra 1 FUSE, Anni/[Briton or MAKING S ME.

ca azmaram mm, P I Be it k own that LALBERT F. lVEIsE, a

citizen of'fthe United States, residing at} Bridgeport' -in the county ofFairfield, State f f Connecticut; have invented certain new'jand nsefulImprovements in Electric Fuses andi 1Methods of Making Same, of pwhich thei following-is a. specification. g The-present inventionrelates to protective Ydevic es and an'ethod of making them for y L electric' icircuits Tand apparatus v connectedthereto, "and nior e especially it relates to- Lenclosed cartridge fuses adapted when intercalated in an"electriciclrcuit to constitute z 3 stand upffithasb'eenobserved, corresponds more or lessdirectly to theflength-of time they ha ve beenmade'or-hav'e been in serv 5 p This apparent agingof a cartridge fuse 3 isbelieve'd ,tobe 'dueftoua diminution of 1ts flcurrent, carrying cross section byjoxidation I 1 or other causes; Where the ends of alink are joined to their; terminals by solder,

, I soldering; fluxes are necessarily used and 1 Fil'any small amount of free flux remaining 1 on the linkf -readily attacks"the oxidizablemetalyz-ujs'uallylzincoraluminum. \VVhere the joints'gare made by'imechanicalmeans,there often; appears to'loe a galvanic action that takesplace therein; also' on account of dif- 'ferences in 'degreefof. expansion and con- I traction of the difi'erent-fmetals'in contact,

, 'there is a progressive tendency to loosening of the contactbetween thefuse link and its terminals so that-the link" blows belowits capacity rating at the joint.

- The objectof my inventionisthe provision of an .ele'ctriofuse of improved construction which will not deteriorate with age rent, andjthe degree *of such. inability to between them.

lpphcatim filed September 10,1924. Seria1.1\T0.736,982. T a 5 and which can be manufactured at "low price and without the exercise of special skill.

" One'embodiment of the invention is-shown v in the; accompanying drawing, in which Fig. 1 is a longitudinal section of. a complete cartridge fuse; Fig. 21s 'a'snnilar section with the parts of the upperterminal separated; Fig; 3' is a plan of a spring coni tact; Fig. 4' is a similarview of a cupped disk, and Fig. 5 is a similar view of a foundation washer.

Themain portion of the housing consists of-a length of insulating tube 1, such as or other springy metal.

'indurated' fibre, with its ends normally j closed bytheterminalcapsQ of sheet brass The fusible link a is a thin wire oriribw bon of soft metal, .such as zinc or aluminum, adapted to melt or fuse at arelatively lolw temperature. In order to connectfeacli-of the ends of the links 8 securely, permanently cap terminal2-WithOut the use of s'older, I;

disk 4 of lead, or -other metal as soft or is composed, and force it against theinner side walls of the-"brass cap 12 with the end of'thefusiblelink" in position to be "gripped On account of the, disk 4 being as soft or softer than the link-3, the

and in good conductive relation-'to its brass v I employ a substantial plug in the form ofwa-.,

i 'softerthan the metal of-which the link '3 w latter will under pressure merely im'loed itself in the former. without loss of'cross section Moreover by employing a lead disk 4 of sufficient thickness, the'degree of pres-' sure exerted thereby upon the inside of the brass cap may be made as great as desired, of course within the elastic limit of the brass part. By springing the brasscap -out- -wardly a relatively "small amount, its,

springy action is made available to. exert constant yielding pressure upon theperiphfiery of the lead disk tand upon the end por-' 'tion of. the link 3 bound between them throughout all conditions of expansion and contraction of the parts incidentto tempera,- ture changes.

In order conveniently to assemble the lead disk 4 in desired position, I make it somewhat spherical or-cup shaped, as shown ice I at the upper end of Fig. 2, and thread the end of the link 3 through a central aperture 5 therein and between it and the end inserta steel Washef 6 to ageins't the,inneiifside all of the Vide extra assurance loffcefitziet between 'the fusible link 3 andtheqeztp t-Joythe insention therein' of a cupped up rphpsphor bronze c1isk1- 7 renderedaflexible byaradial slitsl-fih blionze .7 bears mean its periQpheny' e giainst the flat inner wall of the cap 2%;md

tt its "-centrel pentien" pressesflaga-inst the '1 {fusible link- 3 5 it lies faeiross' the t-ai ce bf the ,iead' disk 4 and Y insures 'goqdi yieldingm'on- *tecet. hetween the several QED-1 13s.;

" llliOTdBI'itQ improve'the 'eontat-suitfelee of the 'lead disk, :I, gpl-ate it-with eepper -01" Other metal of 1 high eehductivityiand high I, t t vtha -bg t .-emhodiinentsof theinventiendmdmr V V I ilsistinfg i11.-threading an end of rseid l-ink resistivity to-bzeidixtionJ After the terminal capsQ 'h'We -be'en'fei'eed" fhome, 1 as roughly indicated Fig. lend at idle-103K 91" end of Fig.

. ediehts,rsiilehi'asdepressingedges9;6hereof lnte the surface of vthe -;tn-be; and @by striking, hrs-Ida 'itoginge, IJdO: not-desire; :tdheire'strieted the'reto. r vv v diVhaltdclaimas newi a'iid d esire to sefeure lby' ihet-tls'ePfiteIItftOf1118 (United States;

' lLAneleetnic fuse-comprising iii-Ii instil atini' honsing lprovidedi'ivith "terminal caps h'flNiIIg' eI'eStiG-Side walls embracing-the end Tt'pertions .of' said housing, linkof :iusihle metal within said-housing, "and meehanie'al- 2 -;1 'qclo lneeted at ihSreIldS wo se-id; Qaps seid ei I me'ei'ianieel connection being made-by a: soft mete-1 disk 'exnended'withi n capscso as 'the'iff "outeisnr frcesmid bound between the,

v the oiitergjsides endPeripheries 0 4. V The method of connectii ga lf isibi c 2, :they ar anchored Y I up n etal disk within said eapzmd'flajttening saidd-isk inpiecete {effect the expansion of'its Pe ph ry m in-$ th nd" of saidflink v tlandthe innei: W-eH 'efsa-id ha veShown{end described herein? i through" avi'igid flat Washer and thmuglhlagi 3 of said *enppe'd disky; inserting' xvithin -sa d tefminefheap :and h pressingisaid gparts (thereto bind the link endsto' and initially tension-45 the side Walls of saidnceipsn 1 V A -.-1'. t U 3 I f ielp fi ing Jan 1 1 1 ing housing provided .With end caps having- *sztid wap's; 21- 21511 1: 0% f filsible met-a1 extendin at itsendsthreugh said disks radialiyacrossz i periphei ies thereof and the inner side Walls of said caps. 7 -3 l e V '3. An electric fuse comp risinganfi nsulat s Mu n -i Pro id l n wp P :tured metal disks 7 Within and e-Xeftingmres; sure, upen -thenside Walls o'it sziid eeps, -iusib1e links-extendingat its ends thid-i %h ja nd over said disks; and s piings between the inner 'suffeeeS ref said ;-ea1as and the -O11t9I $11IfZEfiC6S 10f sa-id metal disks and eper-etihg to press s aid link jends egainst said disks. 7

to the terminw1 cap of enfeleetrie' fuse @011 sist 'ng-i11': ntering en-endpfthe link Within the side wells: of said 0e19,: inserting a eupped nemesis e yzQtse ehe ALBERT F. WEISE; 

